Yesterday, before your post, I did manage to make the forum view work in the frontend

In the ACP I went to "General" - then "Board Setting" - Board Style setting = 2 x Platinum (Default and Guest)

Then click on "General" again and "Run now" under Purge the Cache.

That made the Platinum come up in the front view.

Now I still have two problems

1. My backend view is till the Prosilver lightblue colors

2. In frontend view, I have two large sections with 10 and 12 (sub)forums. They are not so nice looking, because in the middle, they kind of "fade" into white color. Under my other 3-(sub)forum sections, the blue color is much "warmer" and nicer looking.

You'll probably have to take a look to understand my explanation.

I will try to deactivate ProSilver, Purge again and activate, to see if that gives any change

Question: Will it help to select "Yes" "Override user style" for any of the above problems?

I just tried to Disable the ProSilver, Purge the Cache and Enable ProSilver again

It didn't make any visible change.

Please see attachments.
The 10 Subforums are on the main page, and "White"
When clicking on a single forum, i.e. "Brunei" it becomes much nicer, with 2 shades of blue and the yellow, when hovering the mouse over.

Maybe I need to make the 10 sub-forums into smaller section of either 1,3 or 4, like with the others on the main-page?